CN103741466A - Modified fiber for fracturing and preparation process - Google Patents
Modified fiber for fracturing and preparation process Download PDFInfo
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- CN103741466A CN103741466A CN201310698383.XA CN201310698383A CN103741466A CN 103741466 A CN103741466 A CN 103741466A CN 201310698383 A CN201310698383 A CN 201310698383A CN 103741466 A CN103741466 A CN 103741466A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 230000004048 modification Effects 0.000 claims abstract description 84
- 238000012986 modification Methods 0.000 claims abstract description 84
- 238000000967 suction filtration Methods 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 42
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 24
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 24
- 238000005516 engineering process Methods 0.000 claims description 18
- -1 Perfluorinated alkoxy vinyl ether Chemical compound 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000004743 Polypropylene Substances 0.000 claims description 8
- 239000003963 antioxidant agent Substances 0.000 claims description 8
- 230000003078 antioxidant effect Effects 0.000 claims description 8
- 239000000839 emulsion Substances 0.000 claims description 8
- 229910052731 fluorine Inorganic materials 0.000 claims description 8
- 239000011737 fluorine Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 8
- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical class [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 claims description 8
- 238000010792 warming Methods 0.000 claims description 8
- YXGOYRIWPLGGKN-UHFFFAOYSA-N 2,3-ditert-butylbenzene-1,4-diol Chemical compound CC(C)(C)C1=C(O)C=CC(O)=C1C(C)(C)C YXGOYRIWPLGGKN-UHFFFAOYSA-N 0.000 claims description 6
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 6
- 229920000728 polyester Polymers 0.000 claims description 6
- 239000004642 Polyimide Substances 0.000 claims description 5
- 229920001721 polyimide Polymers 0.000 claims description 5
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 4
- 239000003607 modifier Substances 0.000 abstract description 3
- 239000002904 solvent Substances 0.000 abstract description 3
- 230000003746 surface roughness Effects 0.000 abstract 1
- 238000005303 weighing Methods 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 28
- 239000004576 sand Substances 0.000 description 16
- 239000003292 glue Substances 0.000 description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 4
- 230000000844 anti-bacterial effect Effects 0.000 description 4
- 239000003899 bactericide agent Substances 0.000 description 4
- 239000004927 clay Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 229920013818 hydroxypropyl guar gum Polymers 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 4
- 239000003431 cross linking reagent Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
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- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 239000004971 Cross linker Substances 0.000 description 1
- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 description 1
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Abstract
The invention discloses a modified fiber for fracturing. The modified fiber is prepared from the following raw materials in parts by weight: 40-60 parts of base fibers and 45-85 parts of fiber surface modifier. A preparation process of the modified fiber for fracturing comprises the following steps: S1. selecting the base fibers which satisfy the following conditions: the fiber density is 0.93-1.85g/cm<3>, the fiber length is 2-14mm, the fiber tensile strength is 15-3000MPa and the fiber diameter is 15-150mu m; S2. preparing the fiber surface modifier for fracturing; S3. weighing; S4. carrying out surface modification; S5. carrying out suction filtration; S6. drying. The surface properties of the fiber can be obviously improved after the base fibers are modified, so that the fiber can be fully dispersed in the solvent, and meanwhile, the surface roughness of the fiber is improved and the fiber hydrophobicity is improved. The preparation process provided by the invention has the advantages of simple steps, convenience in operation and low cost.
Description
Technical field
The invention belongs to oil-gas field development pressing crack construction Material Field, specifically relate to modified fibre and preparation technology for a kind of pressure break.
Background technology
Conventional fracturing technology exists the row of returning at a high speed to affect the normal contradiction of producing of gas well with proppant backflow, particularly in to gas reservoir development process, have a large amount of high pressure high gas rate wells, these high pressure high gas rate well proppant backflow problem of shaking out is more outstanding, during discharge opeing after pressure, production test and adopt initial stage (the about 1-3 month) of gas transmission, there is proppant backflow in various degree in 50% the well (layer) of having an appointment, proppant backflow amount is generally at 1m
3in, minority well surpasses 1m
3, even reach 3m
3.The hazard ratios such as because gas well pressure is high, output is high, flow velocity is fast, proppant backflow is shaked out quite strong to the erosion attack effect of well head and ground flow pipeline gate valve, ground installation, the sand thorn erosion attack of generation are larger.Gas well shakes out and has reduced bubble row technological effect, has reduced the production time efficiency of gas well, and estimating affects gas well production time efficiency 0.5% left and right because shaking out, and has had a strong impact on the normal production of gas well, and exists serious potential safety hazard.
For the problems referred to above, new development both at home and abroad fiber fracturing technology, it is by the interaction between fiber and proppant, to form space network structure to provide support cohesive force extra between agent and crack, thereby proppant is stabilized in to home position, and fluid can freely pass through.Fracturing fluid starts after the row of returning, and due to washing away that fluid flows, plasticity shearing deformation just occurs proppant particles, forms a series of domes; The fiber axial force that during discharge opeing, the detrusion of sand arch is brought out can be resisted the detrusion of sand arch, thereby improves stability and the critical discharge speed of sand arch, is conducive to control returning of proppant and tells; Fiber does not interact with fracturing fluid, and temperature, pressure and closed-in time are not required.After pressure, can improve discharge speed, shorten the row's of returning time, improve the row of returning and lead.
For guaranteeing the construction of fiber fracturing technology smoothly and will obtaining better effects, pressure break should possess in clear water with fiber and have in the fracturing fluid base fluid of viscosity and have preferably from dispersibility, thereby fiber forms spacial framework in dispersion process reaches auxiliary outstanding sand ability, fiber itself need to have the requirements such as certain size, diameter, density and tensile strength simultaneously, should not have a negative impact in addition as the material for pressing crack construction for performances such as crosslinked, the broken glue of fracturing fluid.In fiber fracturing construction the surface property of fiber can be on it dispersiveness in fracturing fluid, whether form network structure and make a significant impact, conventional fibre can not meet above-mentioned requirements at present, therefore need to carry out surface modification to it, through retrieval, there is not pair pressure break with fiber, to carry out the relevant report of surface modification.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art, a kind of pressure break modified fibre is provided, by base fiber being carried out to can significantly improve after modification the surface property of fiber, fiber can be fully disperseed in solvent, increase the roughness of fiber surface simultaneously, improved the hydrophobicity of fiber; Another object of the present invention is to provide the preparation technology of a kind of pressure break with modified fibre, this preparation technology has advantages of that step is simple, easy to operate, cost is low.
Object of the present invention is achieved through the following technical solutions: a kind of pressure break modified fibre, and it is prepared from by the raw material of following weight parts:
Base fiber: 40～60, fiber surface modification agent: 45～85;
Described fiber surface modification agent is comprised of the raw material of following weight parts:
Vinyl silanes: 20～32; Perfluorinated alkoxy vinyl ether: 8～18;
Antioxidant: 1～5; Water-based fluorine acrylic emulsion: 6～12;
Ethylene glycol: 5～15; Isopropyl alcohol: 13～58.
Described antioxidant is one or both in 2,6-di-tert-butyl-4-methy phenol, ditert-butylhydro quinone.
Described base fiber is one or more in polypropylene fibre, polyester fiber, polyimide fiber, vinal, polyacrylonitrile fibre.
The preparation technology of modified fibre for above-mentioned pressure break, it comprises the following steps:
S1. select base fiber: described base fiber meets the following conditions:
S2. prepare pressure break fiber surface modification agent: by above-mentioned formulated, standby;
S3. weigh: press formula rate and weigh base fiber and fiber surface modification agent;
S4. surface modification: pressure break is moved in there-necked flask with fiber surface modification agent, heating flask rapid stirring solution, make solution be warming up to 40～55 ℃, in there-necked flask, adds base fiber, under constant temperature, fully stir 80～100min, described thermostat temperature is 40～55 ℃;
S5. suction filtration: the base fiber after step S4 surface modification is moved on filter paper, it is carried out to suction filtration after being cooled to normal temperature;
S6. dry: the baking oven that the fiber after suction filtration is placed in to 65～75 ℃ is dried, and described drying time is 22～26h, obtains the pressure break fiber of surface modification.
The present invention has the following advantages: the present invention carries out after modification base fiber with fiber surface modification agent, can significantly improve fiber surface performance, to a certain degree improves fibre density, for fiber can fully disperse to lay a good foundation in solvent; Increased the roughness of fiber surface simultaneously, make fiber surface there is hydrophobicity, therefore fiber can form spacial framework in water, form " skeleton " of the outstanding sand of auxiliary fracturing fluid gel, and the fiber after modification is to of the fracturing fluid serviceability, as base fluid viscosity, the broken colloidality energy of one-tenth, pump-conveying property etc. do not produce any negative effect; This preparation technology has advantages of that step is simple, easy to operate, cost is low.
Accompanying drawing explanation
The pressure break fiber schematic diagram of Fig. 1 for not carrying out modification;
Fig. 2 is the fiber schematic diagram of the pressure break after modification.
The specific embodiment
Below in conjunction with embodiment, the present invention will be further described, and protection scope of the present invention is not limited to the following stated.
Embodiment 1: a kind of pressure break modified fibre, and it is prepared from by the raw material of following weight parts: polypropylene fibre: 40, fiber surface modification agent: 45.
Described fiber surface modification agent is comprised of the raw material of following weight parts:
Vinyl silanes: 20; Perfluorinated alkoxy vinyl ether: 8;
2,6-di-tert-butyl-4-methy phenol: 1; Water-based fluorine acrylic emulsion: 6;
Ethylene glycol: 5; Isopropyl alcohol: 13.
The preparation technology of modified fibre for above-mentioned pressure break, it comprises the following steps:
S1. select base fiber: described base fiber meets the following conditions:
Fibre density: 0.93g/cm
3, fibre length: 2mm,
Fibre tensile strength: 15MPa, fibre diameter: 15 μ m;
S2. prepare pressure break fiber surface modification agent: by above-mentioned formulated, standby;
S3. weigh: press formula rate and weigh base fiber and fiber surface modification agent;
S4. surface modification: pressure break is moved in there-necked flask with fiber surface modification agent, and heating flask rapid stirring solution, make solution be warming up to 40 ℃, adds base fiber in there-necked flask, fully stirs 80min under constant temperature, described thermostat temperature is 40 ℃;
S5. suction filtration: the base fiber after step S4 surface modification is moved on filter paper, it is carried out to suction filtration after being cooled to normal temperature;
S6. dry: the baking oven that the fiber after suction filtration is placed in to 65 ℃ is dried, and described drying time is 22h, obtains the pressure break fiber of surface modification.
Embodiment 2: a kind of pressure break modified fibre, and it is prepared from by the raw material of following weight parts: base fiber: 60, fiber surface modification agent: 85;
Described base fiber is polypropylene fibre and polyester fiber, and weight ratio is 2:1.
Described fiber surface modification agent is comprised of the raw material of following weight parts:
Vinyl silanes: 32; Perfluorinated alkoxy vinyl ether: 18;
Ditert-butylhydro quinone: 5; Water-based fluorine acrylic emulsion: 12;
Ethylene glycol: 5; Isopropyl alcohol: 58.
The preparation technology of modified fibre for above-mentioned pressure break, it comprises the following steps:
S1. select base fiber: described base fiber meets the following conditions:
Fibre density: 1.85g/cm
3, fibre length: 14mm,
Fibre tensile strength: 3000MPa, fibre diameter: 150 μ m;
S2. prepare pressure break fiber surface modification agent: by above-mentioned formulated, standby;
S3. weigh: press formula rate and weigh base fiber and fiber surface modification agent;
S4. surface modification: pressure break is moved in there-necked flask with fiber surface modification agent, and heating flask rapid stirring solution, make solution be warming up to 55 ℃, adds base fiber in there-necked flask, fully stirs 100min under constant temperature, described thermostat temperature is 55 ℃;
S5. suction filtration: the base fiber after step S4 surface modification is moved on filter paper, it is carried out to suction filtration after being cooled to normal temperature;
S6. dry: the baking oven that the fiber after suction filtration is placed in to 75 ℃ is dried, and described drying time is 26h, obtains the pressure break fiber of surface modification.
Embodiment 3: a kind of pressure break modified fibre, and it is prepared from by the raw material of following weight parts: base fiber: 40, fiber surface modification agent: 85; Described base fiber is polypropylene fibre, polyester fiber and polyimide fiber, and weight ratio is 3:2:1.
Described fiber surface modification agent is comprised of the raw material of following weight parts:
Vinyl silanes: 22; Perfluorinated alkoxy vinyl ether: 12;
Antioxidant: 2; Water-based fluorine acrylic emulsion: 8;
Ethylene glycol: 8; Isopropyl alcohol: 18;
Described antioxidant is 2,6-di-tert-butyl-4-methy phenol, ditert-butylhydro quinone, and weight ratio is 4:1.
The preparation technology of modified fibre for above-mentioned pressure break, it comprises the following steps:
S1. select base fiber: described base fiber meets the following conditions:
Fibre density: 1.25g/cm
3, fibre length: 4mm,
Fibre tensile strength: 50MPa, fibre diameter: 30 μ m;
S2. prepare pressure break fiber surface modification agent: by above-mentioned formulated, standby;
S3. weigh: press formula rate and weigh base fiber and fiber surface modification agent;
S4. surface modification: pressure break is moved in there-necked flask with fiber surface modification agent, and heating flask rapid stirring solution, make solution be warming up to 42 ℃, adds base fiber in there-necked flask, fully stirs 85min under constant temperature, described thermostat temperature is 45 ℃;
S5. suction filtration: the base fiber after step S4 surface modification is moved on filter paper, it is carried out to suction filtration after being cooled to normal temperature;
S6. dry: the baking oven that the fiber after suction filtration is placed in to 68 ℃ is dried, and described drying time is 23h, obtains the pressure break fiber of surface modification.
Embodiment 4: a kind of pressure break modified fibre, and it is prepared from by the raw material of following weight parts: base fiber: 50, fiber surface modification agent: 75; Described base fiber is polypropylene fibre, polyester fiber, polyimide fiber and vinal, and weight ratio is 4:3:2:2.
Described fiber surface modification agent is comprised of the raw material of following weight parts:
Vinyl silanes: 25; Perfluorinated alkoxy vinyl ether: 14;
Antioxidant: 3; Water-based fluorine acrylic emulsion: 10;
Ethylene glycol: 10; Isopropyl alcohol: 25;
Described antioxidant is 2,6-di-tert-butyl-4-methy phenol, ditert-butylhydro quinone, and weight ratio is 1:2.The preparation technology of modified fibre for above-mentioned pressure break, it comprises the following steps:
S1. select base fiber: described base fiber meets the following conditions:
Fibre density: 1.45g/cm
3, fibre length: 6mm,
Fibre tensile strength: 100MPa, fibre diameter: 75 μ m;
S2. prepare pressure break fiber surface modification agent: by above-mentioned formulated, standby;
S3. weigh: press formula rate and weigh base fiber and fiber surface modification agent;
S4. surface modification: pressure break is moved in there-necked flask with fiber surface modification agent, and heating flask rapid stirring solution, make solution be warming up to 45 ℃, adds base fiber in there-necked flask, fully stirs 92min under constant temperature, described thermostat temperature is 48 ℃;
S5. suction filtration: the base fiber after step S4 surface modification is moved on filter paper, it is carried out to suction filtration after being cooled to normal temperature;
S6. dry: the baking oven that the fiber after suction filtration is placed in to 70 ℃ is dried, and described drying time is 24h, obtains the pressure break fiber of surface modification.
Embodiment 5: a kind of pressure break modified fibre, and it is prepared from by the raw material of following weight parts: base fiber: 52, fiber surface modification agent: 62; Described base fiber is polypropylene fibre, polyester fiber, polyimide fiber, vinal and polyacrylonitrile fibre, and weight ratio is 1:1.5:3:3.
Described fiber surface modification agent is comprised of the raw material of following weight parts:
Vinyl silanes: 28; Perfluorinated alkoxy vinyl ether: 16;
2,6-di-tert-butyl-4-methy phenol: 4; Water-based fluorine acrylic emulsion: 10;
Ethylene glycol: 12; Isopropyl alcohol: 36.
The preparation technology of modified fibre for above-mentioned pressure break, it comprises the following steps:
S1. select base fiber: described base fiber meets the following conditions:
Fibre density: 1.60g/cm
3, fibre length: 10mm,
Fibre tensile strength: 800MPa, fibre diameter: 98 μ m;
S2. prepare pressure break fiber surface modification agent: by above-mentioned formulated, standby;
S3. weigh: press formula rate and weigh base fiber and fiber surface modification agent;
S4. surface modification: pressure break is moved in there-necked flask with fiber surface modification agent, and heating flask rapid stirring solution, make solution be warming up to 52 ℃, adds base fiber in there-necked flask, fully stirs 98min under constant temperature, described thermostat temperature is 52 ℃;
S5. suction filtration: the base fiber after step S4 surface modification is moved on filter paper, it is carried out to suction filtration after being cooled to normal temperature;
S6. dry: the baking oven that the fiber after suction filtration is placed in to 72 ℃ is dried, and described drying time is 25h, obtains the pressure break fiber of surface modification.
Embodiment 6: a kind of pressure break modified fibre, and it is prepared from by the raw material of following weight parts: base fiber: 55, fiber surface modification agent: 70; Described base fiber is polypropylene fibre, vinal and polyacrylonitrile fibre, and weight ratio is 5:2:2.
Described fiber surface modification agent is comprised of the raw material of following weight parts:
Vinyl silanes: 30; Perfluorinated alkoxy vinyl ether: 15;
Ditert-butylhydro quinone: 2.5; Water-based fluorine acrylic emulsion: 11;
Ethylene glycol: 8; Isopropyl alcohol: 46;
The preparation technology of modified fibre for above-mentioned pressure break, it comprises the following steps:
S1. select base fiber: described base fiber meets the following conditions:
Fibre density: 1.75g/cm
3, fibre length: 12mm,
Fibre tensile strength: 1000MPa, fibre diameter: 120 μ m;
S2. prepare pressure break fiber surface modification agent: by above-mentioned formulated, standby;
S3. weigh: press formula rate and weigh base fiber and fiber surface modification agent;
S4. surface modification: pressure break is moved in there-necked flask with fiber surface modification agent, and heating flask rapid stirring solution, make solution be warming up to 36 ℃, adds base fiber in there-necked flask, fully stirs 96min under constant temperature, described thermostat temperature is 52 ℃;
S5. suction filtration: the base fiber after step S4 surface modification is moved on filter paper, it is carried out to suction filtration after being cooled to normal temperature;
S6. dry: the baking oven that the fiber after suction filtration is placed in to 70 ℃ is dried, and described drying time is 22h, obtains the pressure break fiber of surface modification.
Embodiment 7: performance evaluation
1. experiment material
Adopting the base fiber of embodiment 6 and the pressure break fiber of surface modification is tested object.
2. key property evaluation: comprise observation, measure density, length, diameter, experimental result is as shown in table 1.
Table 1: key property evaluation result
As shown in Table 1: unmodified fibre density, length, diameter are respectively 1.291g/cm
3, 6.2mm, 38 μ m, adopt its density of fiber, length, the diameter of surface modifier modification to be respectively 1.302g/cm
3,, 6.2mm, 38 μ m, show: the basic physics index of fiber is substantially constant before and after modification.
3. the impact on fracturing fluid plastic, broken colloidality energy
A. preparing fracturing fluid
Formula is: 0.40% hydroxypropyl guar gum+0.3% bactericide+0.5% clay stabilizer+0.5% cleanup additive+0.2% sodium carbonate
B. measure
The organic borate cross-linker that in experiment, crosslinking agent used is 0.4%; Broken colloidality energy activity rating adopts persulfate activity rating method, and testing persulfate used is ammonium persulfate, and concentration is 200ppm, and experimental result is as shown in table 2.
The impact of table 2. fiber on fracturing fluid crosslinking time, broken colloidality energy
As shown in Table 2: the fiber that surface modification is crossed can be substantially without impact on fracturing fluid crosslinking time, broken colloidality.
4. dispersed experiment
A. prepare base fluid and frozen glue
Base fluid formula is: 0.40% hydroxypropyl guar gum+0.3% bactericide+0.5% clay stabilizer+0.5% cleanup additive+0.2% sodium carbonate
Frozen glue formula is: 0.40% hydroxypropyl guar gum+0.3% bactericide+0.5% clay stabilizer+0.5% cleanup additive+0.2% sodium carbonate+0.4% organic boron
B. measure
The fiber of modification is joined respectively in clear water, base fluid, three kinds of solution of frozen glue, and the addition of fiber is solution weight 0.5%, observes respectively the dispersiveness of fiber in three kinds of solution, and result is as shown in table 3.
The dispersed result of table 3. fiber in clear water, base fluid and frozen glue
| Liquid title | Dispersed |
| Clear water | Fiber dispersion is good, without the sinkage that obviously floats; |
| Base fluid | It is thread dispersed that fiber is, without agglomerating phenomenon, without floating, sinkage |
| Frozen glue | Fiber dispersion is even, and hanging property of frozen glue is good, viscoplasticity is good, smooth |
As shown in Table 3: the dispersiveness of the fiber after modification in clear water, base fluid and frozen glue is all better, for fiber fracturing construction is laid a good foundation.
5. auxiliary outstanding sand aptitude tests
A. prepare base fluid
Base fluid formula is: 0.40% hydroxypropyl guar gum+0.3% bactericide+0.5% clay stabilizer+0.5% cleanup additive+0.2% sodium carbonate; Crosslinking agent: 0.4% organic boron
B. method of testing
Get 400mL base fluid to wide-mouth bottle, first add crosslinking agent, then according to 30% sand ratio, add haydite (particle diameter 0.425～0.850mm, density 1.78g/cm
3) and the fiber of 0.5% haydite weight (disperseing through manual in advance), fast load weighted haydite and fiber being added in wide-mouth bottle, the wide-mouth bottle that then rocks rapidly sealing mixes haydite and fiber in fracturing fluid.Outstanding sand fracturing fluid after mixing is standing, observe haydite sedimentation situation, do the fracturing fluid that does not add fiber is contrast simultaneously.
C. experimental result: as shown in table 4.
The auxiliary outstanding sand aptitude tests result of table 4. fiber
As shown in Table 4,0h, 2h, 10h, 50h, 120h, do not add haydite height in the wide-mouth bottle of fiber and be respectively: 9.7cm, 9.7cm, 7.2cm, 5.5cm, 3.6cm; Adding haydite height in the wide-mouth bottle of fiber of modification is respectively: 9.7cm, 9.7cm, 9.6cm, 9.2cm, 8.5cm, add haydite height in the wide-mouth bottle of unmodified fiber and be respectively: 9.7cm, 9.5cm, 9.0cm, 7.2cm, 6.5cm.Result shows: add fiber after modification with respect to not adding fiber, its outstanding sand ability significantly strengthens.
6. on short-term flow conductivity impact test
Metering system is API linear flow, and measuring media is deionized water, and sanding concentration is 10kg/m
2concrete measuring method is: according to sanding concentration and sand ratio, take intermediate density haydite, be mixed with the fracturing fluid gel containing modified fibre, at 90 ℃, break after glue (0.02% ammonium persulfate), with 180 order normal test sieves, filter breaking glue solution, oversize is transferred to diversion chamber and strikes off, and with the flow conductivity at 25 ℃ of deionized water tests, experimental result is as shown in table 5.
Table 5: the fiber of modification affects test result to short-term flow conductivity
As shown in Table 5: add the fiber of modification and do not add fiber flow conductivity, penetration value under identical clossing pressure and change not quite, illustrate that the relative flow conductivity of the fiber adding after modification and permeability are almost without affecting.
From above-mentioned experiment, can find out: improved fiber can produce superpower suspension prop-carrying capacity and proppant crystallized ability, add this novel fiber Sand Fracturing Technology after fiber can realize fractured well fast, the efficient row of returning, fundamentally prevent proppant backflow to shake out and formation sand production; Can effectively keep the long-term flow conductivity that man-made fracture is higher, extend the volume increase term of validity; Good outstanding sand ability can be provided under low stick part, suppress that seam is high excessively to be extended simultaneously effectively, guarantee proppant in the full back-up sand of payzone section and make slit, can obtain longer supporting crack, the longer volume increase term of validity identical in the situation that adding sand scale.
Claims (5)
1. a pressure break modified fibre, is characterized in that, it is prepared from by the raw material of following weight parts:
Base fiber: 40～60, fiber surface modification agent: 45～85.
2. a kind of pressure break modified fibre as claimed in claim 1, is characterized in that, described fiber surface modification agent is comprised of the raw material of following weight parts:
Vinyl silanes: 20～32; Perfluorinated alkoxy vinyl ether: 8～18;
Antioxidant: 1～5; Water-based fluorine acrylic emulsion: 6～12;
Ethylene glycol: 5～15; Isopropyl alcohol: 13～58.
3. a kind of pressure break modified fibre as claimed in claim 2, is characterized in that, described antioxidant is one or both in 2,6-di-tert-butyl-4-methy phenol, ditert-butylhydro quinone.
4. a kind of pressure break modified fibre as claimed in claim 1, is characterized in that, described base fiber is one or more in polypropylene fibre, polyester fiber, polyimide fiber, vinal, polyacrylonitrile fibre.
5. the preparation technology of modified fibre for a kind of pressure break as claimed in claim 1 or 2 or 3 or 4, is characterized in that, it comprises the following steps:
S1. select base fiber: described base fiber meets the following conditions:
Fibre density: 0.93～1.85g/cm
3,
Fibre length: 2～14mm,
Fibre tensile strength: 15～3000MPa,
Fibre diameter: 15～150 μ m;
S2. prepare pressure break fiber surface modification agent: by above-mentioned formulated, standby;
S3. weigh: weigh according to the above ratio base fiber and fiber surface modification agent;
S4. surface modification: pressure break is moved in there-necked flask with fiber surface modification agent, heating flask rapid stirring solution, make solution be warming up to 40～55 ℃, in there-necked flask, adds base fiber, under constant temperature, fully stir 80～100min, described thermostat temperature is 40～55 ℃;
S5. suction filtration: the base fiber after step S4 surface modification is moved on filter paper, it is carried out to suction filtration after being cooled to normal temperature;
S6. dry: the baking oven that the fiber after suction filtration is placed in to 65～75 ℃ is dried, and described drying time is 22～26h, obtains the pressure break fiber of surface modification.
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| CN105086987A (en) * | 2015-08-31 | 2015-11-25 | 中国石油天然气股份有限公司 | Fiber surface treating agent, preparation method and use method thereof, and fiber for fracturing fluid |
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| US11845896B1 (en) | 2022-07-19 | 2023-12-19 | Chengdu LEPS Technology Co., Ltd | Structural stabilizer for fiber and conventional proppant complex in efficient proppant migration and placement technology of fractured well and preparation method |
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| US11845896B1 (en) | 2022-07-19 | 2023-12-19 | Chengdu LEPS Technology Co., Ltd | Structural stabilizer for fiber and conventional proppant complex in efficient proppant migration and placement technology of fractured well and preparation method |
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